Combined GPS measurements and radar interferometry (InSAR) have been applied at Mt. Etna to study the ground deformation affecting the volcano both over the long- (1993–2000) and short-term (1997–1998 and 1998–2000). The aim was to better understand the dynamics of the volcano during the magma-recharging phase following the 1991–93 eruption. Since 1993, InSAR and GPS data indicate that Mt. Etna has undergone an inflation. A deep intrusion was detected by InSAR, on the western flank of the volcano, between March and May 1997. In the following months, this intrusion rose up leading to a seismic swarm occurring in January 1998 in the western sector. This now shallow intrusion is confirmed by GPS data. From 1998 to 2000, a general deflation affecting the upper part of the volcano was detected. Over the whole study period, a continuous eastward to south-eastward motion of the eastern sector of the volcano was also evidenced. The analytical inversions of GPS data inferred a plane dipping about 12°ESE, located beneath the eastern flank of the volcano at a depth of 1.4 km b.s.l. The movement along this plane is able to reproduce the observed south-eastward motion of a sector bounded northward by the Pernicana fault, westward by the North–East Rift and the South Rift, and southward by the Mascalucia–Tremestieri–Trecastagni fault system. InSAR data have validated this model.
|Titolo:||Ground deformation patterns at Mt. Etna from 1993 to 2000 from joint use of InSAR and GPS techniques|
|Data di pubblicazione:||2008|
|Appare nelle tipologie:||1.1 Articolo in rivista|